Cloud Point Phenomena in the (Aniline or N,N-Dimethylaniline + Water) Solutions, and Cosolvent Effects of Liquid Poly(ethylene glycol) Addition: Experimental Measurements and Modeling

Abstract

In this work, liquid phase behavior (cloud point phenomena) was studied for two binary and four aqueous pseudobinary systems containing aniline or N,N-dimethylaniline and poly(ethylene glycol) 200 or poly(ethylene glycol) 400, (PEG200 and PEG400, respectively) in the temperature range T = (290.15 to 351.15) K and an ambient pressure of 0.1 MPa. Experimental data (cloud-points) were obtained by the visual cloud point method. The studied systems exhibit an upper critical solution temperature (UCST) type of phase behavior and the immiscibility increases with increasing the average molar mass of poly(ethylene glycols). PEG200/PEG400 showed as a good cosolvent for aniline in water. The experimental data were correlated using non-random two-liquid model (NRTL) with one form of temperature dependent parameters.

Reference materials for phase equilibrium studies. 1. Liquid–liquid equilibria (IUPAC Technical Report)

“…These additional data are in fair agreement with the earlier work, except for the solubility of aniline in water from Ref. [15], which looks erroneous (Fig. 1) and, hence, was rejected.…”

“…The literature sources associated with the LLE data for this system are listed in Supplement 1A. Two additional sources [14,15] have appeared since this SDS publication, and one publication [16] was not included in the SDS-96-3 evaluation. These additional data are in fair agreement with the earlier work, except for the solubility of aniline in water from Ref.…”

“…The rejected solubilities of aniline in water from Ref. [15] are shown as red triangles. The points, which are designated as doubtful in the SDS-96-3 evaluation, are not shown in the figure.…”

An Efficient Way of Visualization of Mutual Solubility Data in the Whole Range of Compositions

“…Mutual solubility data of aniline (1) + water (2) at p = 100 kPa or vapor saturation − in the linear scale (a), logarithmic scale (b), and the proposed composition-stretched scale (c). The data set highlighted by red color is from Grozdanic et al …”

Effects of solid poly (ethylene glycols) addition to the solutions of aniline or N,N-dimethylaniline with water: Experimental measurements and modeling

“…4 PEGs, particularly in their liquid form, have wide spectrum of applications as solvents and co-solvents in organic synthesis, 5 catalysis, 2 food industry 6 and biotechnology. 7 In the previous study, 8 liquid PEGs as co-solvents for aniline and N,N-dimethylaniline in water were investigated, assessing possible impacts on the application of these aromatic compounds in dye industry. As a continuation, this study is investigating the possibility to use 790 SOLDATOVIĆ et al…”